﻿#define _CRT_SECURE_NO_WARNINGS  1
//一定要动手，例子不管多么简单，建议至少自己手敲一遍看看是否理解了里头的细枝末节。
//一定要学会思考，思考为什么要这样，而不是那样。还要举一反三地思考
#include"stack.h"
void STInit(ST* ps)
{
	assert(ps);
	ps->a = NULL;
	ps->capacity = 0;
	ps->top = 0;
}
void STDestory(ST* ps)
{
	assert(ps);
	free(ps->a);
	ps->a = NULL;
	ps->top = ps->capacity = 0;
}
void STPush(ST* ps,STDataType x)
{
	assert(ps);
	if (ps->top == ps->capacity)
	{
		int newCapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
		STDataType* tmp = (STDataType*)realloc(ps->a, sizeof(STDataType) * newCapacity);
		if (tmp == NULL)
		{
			perror("relloc fail");
			exit(-1);
		}
		ps->a = tmp;
		ps->capacity = newCapacity;
	}
	ps->a[ps->top] = x;
	ps->top++;
}
void STPop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);
	--ps->top;
}
bool STEMpty(ST* ps)
{
	assert(ps);
	return ps->top == 0;
}
STDataType STTop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);
	return ps->a[ps->top - 1];
}
bool isvalid(char* s)
{

}